Yamaha - Water Pump Housing - 688-44311-01-00 - See Description for Applicable Engine Models Yamaha-F150-2017 A: A secure gear case

A: A secure gear case protects internal components and maintains proper alignment for efficient performance

and other exposed metal gear

Just replace one wire at a time

It softens gear engagement and helps cut down on prop chatter

Yamaha - Water Pump Housing - 688-44311-01-00 - See Description for Applicable Engine Models Yamaha-F150-2017 A: A secure gear caseYamaha Water Pump Housing 60, 70, 75, 90 Cooling System Component 688 44311 01 00 Overview On these mid range Yamaha two strokes, the water pump housing is what keeps the cooling system working the way it should. It holds the impeller in place and directs water up through the engine, keeping temps under control. If it gets worn or scored, youll lose water pressure fastand thats when overheating problems start creeping in. Swapping it out during a pump